docs: def _handleBackspace(self):
          """ Handles backspace characters """
          if self.cursorPos > 0:
              #print( 'cp:',self.cursorPos,'was:', self.inputBuffer)
              self.inputBuffer = self.inputBuffer[0:self.cursorPos-1] + self.inputBuffer[self.cursorPos:]
              self.cursorPos -= 1
              #print ('cp:', self.cursorPos,'is:', self.inputBuffer)                        
              self._refreshInputPrompt(len(self.inputBuffer)+1)